NGC 6087

NGC 6087 (also known as Caldwell 89 or the S Normae Cluster) is an open cluster of 40 or more^[2][3] stars centered on the Cepheid variable S Normae in the constellation Norma. At a distance of about 3500 ly and covering a field of almost one quarter of a degree, the stars range from seventh- to eleventh-magnitude, the brightest being 6.5 magnitude S Normae. The aggregate visual magnitude of the cluster is about 5.4.

NGC 6087
Observation data (J2000 epoch)
Right ascension	16h 18m 48s[1]
Declination	−57° 56′[1]
Distance	~3500LY (~1000pc)
Apparent magnitude (V)	5.4
Apparent dimensions (V)	12′
Physical characteristics
Other designations	S Normae Cluster, Caldwell 89, Cr 300
Associations
Constellation	Norma
See also: Open cluster, List of open clusters

Map showing the location of NGC 6087

Spectral analysis of the radial motion of the stars confirm that S Normae is a member of the cluster,^[3] and the period/luminosity relationship of Cepheid variables allows the distance to be determined with confidence.